Render the panel numbers programmatically.
Attach "onmouseover" event for changing the panels.

Move the mouse over the bottom numbers to change the panels.

Example Code

ASPX

<div id="divCustomManualChanger" runat="server"></div>

<obshow:Show id="Show1" runat="server" ShowType="manual" ManualChanger="false">
    <Panels>
        <obshow:Panel>
            ... Panel Content here ...    


C#

        int panelIndex;
        for (panelIndex=1;panelIndex<=Show1.Panels.Count;panelIndex++)
        {
            HtmlAnchor panelIndexAnchor = new HtmlAnchor();
            panelIndexAnchor.InnerText = panelIndex.ToString();
            panelIndexAnchor.Attributes.Add("onmouseover", "Show1.MoveToPanel(" + panelIndex + ")");
            divCustomManualChanger.Controls.Add(panelIndexAnchor);
        }